Air bed with stable supporting structure

ABSTRACT

An air bed with a stable supporting structure comprises a periphery sheet, a top sheet, and a bottom sheet. A middle sheet separates an air bed into an upper air-chamber and a lower air-chamber, an outer extending strip separates the upper air-chamber into a peripheral air-chamber and an upper main air-chamber, a first set of extending strip is provided in the upper main air-chamber, a second set of extending strip, which is welded with the middle sheet and the bottom sheet, is provided in the lower air-chamber, and an oblique extending strip is provided around the periphery of the second extending strip and is welded with the periphery sheet and the bottom sheet to separate the lower air-chamber into a lower main air-chamber and a peripheral auxiliary air-chamber. The lower main air-chamber is a space which has a shape of inverse cone and receives air therein, its outer surface is concave with respect to the outer surface of the peripheral auxiliary air-chamber, that is, the surface of the peripheral auxiliary air-chamber is higher than the surface of the bottom sheet of the lower main air-chamber. The air bed has the advantages of excellent stability, simple structure and beautiful appearance.

BACKGROUND OF THE INVENTION

The present invention relates to an air bed used for family and camping, more specifically, to an air bed with a stable supporting structure.

Air bed which can be carried and stored easily and can make user very comfortable is enjoyed by users and becomes more and more popular. This kind of bed can be not only as a spare bed for visitor or friend in family, but also widely used in camping. However, the conventional air bed has a light weight itself and a height higher than the air mattress, therefore, it is not sufficiently stable, hence, when an user lies or sits on the edge of an air bed, one side of the bed is liable to rise, even the bed would be turned over, making the user fall off. In order to solve the problem, some improvements have been made to the air bed. As shown in FIG. 4 and FIG. 5, a conventional air bed comprises periphery sheet 1, top sheet 2, bottom sheet 3, middle sheet 4, parallel extending strip set 5 of upper air-chamber and parallel extending strip set 6 of lower air-chamber; in this air bed, supporting air-chamber 7 is provided on the border between the upper air-chamber and the lower air-chamber, one or more air stabilizing bar 8 are provided around its periphery at the bottom, hence, the surface area is increased, the weight is dispersed, and the possibility of turning over is decreased. As shown in FIG. 6 and FIG. 7, another conventional air bed also comprises periphery sheet 1, top sheet 2, bottom sheet 3, middle sheet 4, parallel extending strip set 5 of upper air-chamber and parallel extending strip set 6 of lower air-chamber; in this air bed, the upper air-chamber and the lower air-chamber are separate air-chambers which are not communicated with each other for air, stabilizing ring 7 as a separate air-chamber which is not communicated with the lower air-chamber is provided at the bottom of the air bed, the periphery of stabilizing ring 7 being larger than the lower air-chamber. The stability of the air bed is increased by provision of stabilizing ring 7. Although these two kinds of air bed can be kept in a stable state and possibility of its turning over can be decreased, three drawbacks exist in them: (i) the air stabilizing bars and stabilizing ring are provided around the periphery of the air bed at its bottom and have a larger volume, an user, especially an old man or oldster and a child is liable to tread onto a protrusive air stabilizing bar or stabilizing ring to fall off, resulting in an injury, (ii) above two kinds of air bed have a complicated structure which would decrease production efficiency and increase production cost, (iii) the air beds do not have a very beautiful appearance.

SUMMARY OF THE INVENTION

The object of the present invention is to overcome above drawbacks of the prior art and provide an air bed satisfactory security, simple structure and very beautiful appearance. The present invention comprises a periphery sheet, a top sheet, a bottom sheet, a middle sheet which separates an air bed into an upper air-chamber and a lower air-chamber, a loop of outer extending strip provided in the upper air-chamber which separates the upper air-chamber into a peripheral air-chamber and a upper main air-chamber, and a first set of extending strip which is provided in the upper main air-chamber and consists of a plurality of parallel extending strip; characterized in that the air bed further comprises a second set of extending strips which is provided in the lower air-chamber, consists of a plurality of parallel extending strip and is welded with the middle sheet and the bottom sheet, and an oblique extending strip which is provided around the second extending strip and is welded with the periphery sheet and the bottom sheet to separate the lower air-chamber into a lower main air-chamber and a peripheral auxiliary air-chamber; the lower main air-chamber is a space which has a shape of inverse cone and receives air therein, its outer surface is concave with respect to the outer surface of the peripheral auxiliary air-chamber, that is, the surface of the peripheral auxiliary air-chamber is higher than the surface of the bottom sheet of the lower main air-chamber.

The present invention has the following advantages. The oblique extending strip provided in the lower air-chamber creates a peripheral auxiliary air-chamber from the lower air-chamber while raises the lower main air-chamber, which makes the surface of the peripheral auxiliary air-chamber as an outer loop higher than the surface of the bottom sheet of the lower main air-chamber to contact ground, hence, the air bed has an excellent stability, that is, when an user lies or sits on the edge of the bed, one side of the bed would not rise, the bed is not liable to turn over when used, so that unexpected injury resulting from unreasonable structure can be avoided, besides, the air bed has simple structure, lower production cost and very beautiful appearance.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of the appearance of the present invention;

FIG. 2 is a schematic diagram of the internal structure of the present invention;

FIG. 3 is a sectional schematic diagram of the present invention;

FIG. 4 is a schematic diagram of the internal structure of an air bed of the prior art;

FIG. 5 is a sectional schematic diagram of FIG. 4;

FIG. 6 is a perspective view of the appearance of another air bed of the prior art;

FIG. 7 is a sectional schematic diagram of FIG. 6; and

FIG. 8 is a schematic diagram of the internal structure of another embodiment of the present invention.

DETAILED DESCRIPTION OF SPECIFIC EMBODIMENTS

The preferred embodiment of the present invention will be described further in detail with reference to the accompanying drawings.

As shown in FIGS. 1, 2, and 3, the air bed of the invention comprises periphery sheet 1, top sheet 2, bottom sheet 3 and middle sheet 4, and, the upper edge of periphery sheet 1 is welded with the edge of top sheet 2, the lower edge of periphery sheet 1 is welded with the edge of bottom sheet 3, middle sheet 4 is provided between top sheet 2, and bottom sheet 3 is welded with the middle portion of periphery sheet 1, which separates the air bed into an upper air-chamber A and a lower air-chamber B with air-holes 41 provided on middle sheet 4 to communicate upper air-chamber A with lower air-chamber B. A loop of outer extending strip 5 is provided in upper air-chamber A to separate upper air-chamber A into peripheral air-chamber A1 and upper main air-chamber A2, first set of extending strip 6 which extends from one end of the air bed to the other end and are arranged in parallel longitudinally is provided in upper main air-chamber A2, outer extending strip 5 and first set of extending strip 6 are fuse welded with top sheet 2 and middle sheet 4 with air-holes 51 provided on outer extending strip 5 to communicate peripheral air-chamber A1 with upper main air-chamber A2. Second set of extending strip 7 which extends from one end of the air bed to the other end and are arranged in parallel longitudinally is provided in lower air-chamber B, and second set of extending strip 7 is welded with middle sheet 4 and bottom sheet 3; a loop of oblique extending strip 8 is provided around second set of extending strip 7, and one side edge of oblique extending strip 8 is welded with periphery sheet 1, and the other side edge is welded with bottom sheet 3, which separates lower air-chamber B into lower main air-chamber B2 and a loop of peripheral auxiliary air-chamber B1 with air-holes 81 provided on oblique extending strip 8 to communicate peripheral auxiliary air-chamber B1 with lower main air-chamber B2; lower main air-chamber B2 is a space which has a shape of inverse cone and receives air therein, and its outer surface is concave with respect to the outer surface of the loop of the peripheral auxiliary air-chamber B1, that is, surface C of peripheral auxiliary air-chamber B1 is higher than the surface of bottom sheet 3 of the lower main air-chamber 3. Under the action of second set of extending strip 7 and oblique extending strip 8, lower main air-chamber B2 is raised, so that surface C of peripheral auxiliary air-chamber B1 supports the air bed when it contacts supporting surface D. Peripheral auxiliary air-chamber B1 is positioned around the periphery of lower main air-chamber B2 to thereby define supporting points C of the air bed around the periphery of the bottom of the bed at its outer side, therefore, the stability of the air bed is increased. In this embodiment, the air bed can be filled up with air once for its whole air-chambers from air-valve 10 via air-holes 41, 51, 81 with a built-in electrical air pump or other air pump. The air-chambers may be designed to be closed, so that these separate air-chambers not communicated with each other can be inflated one by one from a valve provided in each air-chamber with an air pump.

In another embodiment as shown in FIG. 8, which is similar to the embodiment described above except that a plurality of oblique extending strip 8, for example, four oblique extending strips, two ends of which are not connected with each other, are provided around the periphery of second set of extending strip 7 in lower air-chamber B, and these four oblique extending strip are welded with periphery sheet 1 around the air bed and bottom sheet 3 of the same respectively. 

1. An air bed with a stable supporting structure, comprising a periphery sheet, a top sheet, a bottom sheet, a middle sheet which separates an air bed into an upper air-chamber and a lower air-chamber, a loop of outer extending strip provided in the upper air-chamber which separates the upper air-chamber into a peripheral air-chamber and an upper main air-chamber, and a first set of extending strip which is provided in the upper main air-chamber and consists of a plurality of parallel extending strip; characterized in that the air bed with a stable supporting structure further comprising a second set of extending strip which is provided in the lower air-chamber, and which includes a plurality of parallel extending strips, and is welded with the middle sheet and the bottom sheet, and an oblique extending strip which is provided around the second extending strip and is welded with the periphery sheet and the bottom sheet to separate the lower air-chamber into a lower main air-chamber and a peripheral auxiliary air-chamber; the lower main air-chamber is a space which has a shape of inverse cone and receives air therein, and its outer surface is concave with respect to the outer surface of the peripheral auxiliary air-chamber, that is, the surface of the peripheral auxiliary air-chamber is higher than the surface of the bottom sheet of the lower main air-chamber.
 2. The air bed with a stable supporting structure according to claim 1, wherein a plurality of air-holes are provided on a loop of outer extending strip provided in said upper air-chamber.
 3. The air bed with a stable supporting structure according to claim 1, wherein a plurality of air-holes are provided on an oblique extending strip provided in said lower air-chamber.
 4. The air bed with a stable supporting structure according to claim 1, wherein said oblique extending strip of said lower air-chamber, which becomes a loop, is provided around the periphery of a second set of extending strips, or a plurality of oblique extending strips, which are not connected with each other at two ends of each, are provided around the periphery of the second set of extending strips. 